If you open the generated html file from the local file system, you may receive Security Errors (e.g. NETWORK_ERR: XMLHttpRequest Exception 101).
The reason for that is, that some browsers do not allow the access of local textures or model files.
To solve this issue, you can load the html page from a http:// URL instead of a file:// URL or you can configure your browser for local file access.

For Google Chrome you have to start Chrome with the following parameter: